Automatic control device for elevators.



L. J. MILKE. AUTOMATIC CONTROL DEVICE FOR ELEVATORS, APPLICATION mum MAB.19, 1902.

922,01 6. Patented May 18. 1909.

2 SHEETS-SHEET 1.

L. J. MILKE. AUTOMATIC CONTROL DEVICE FOR ELEVATORS. APPLICATION mum MAB.19,1908.

Patented May 18,1909.

Elnueufov LOUIS J. MILKE, OF BALTIMORE, MARYLAND.

AUTOMATIC CONTROL DEVICE POR,ELEVA'TOES.

Specification or Letters Patent.

Patented May- 18, 1909.

application filed March 19, 1208. Serial No. 422,161.

. To all whom it may concern:

Be it known that I, LOUIS J. MILKE, a citi" zen of the United States, residing at Baltin1ore'city,,State of Maryland, have invented contain new and useful Improvements in Automatic Control Devices for Elevators,

of which the following is a specification.

My invention relates to automatic control devices for elevators and has for its object means by which the operation of the elevator is automatically controlled by. the opening and closing of the elevator door.

The device has for its particular object to revent the starting of the car, after it has eon stopped at a particular landing and the door 0 ened without the door first havin been .clbsed' The device is so constructed that afterthe car has been stopped at a par ticular landing, and the door has been opened, it is impossible to again start the (car without the door first havin been closed, thereby lessening to a degree, t he possibility of accident to a passenger in the entering or leaving the car, occasioned by he premature starting thereof, bv revent =i-ng the starting of the car until t e pas- ;enger has fully entered or passed out thererorn.

With the foregoing object in view, my in vention consists in certain novel features of construction and combinations of parts which will be hereinafter described and pointed out in the claims.

In the. accompanying drawings, Figure 1 is an elevation shaft. Fi 2, is an enlar d sectional view .of t e valve and cylin' or, being the position assumed when the elevator door isopaned; Fl 3, is a sectional'view of the valve. ina di erent osition from that shown in Fig. 2; vi-z.: wig; the door closed. Fig. 4, is :1 longitudinal sectional view of the valve, the body being in elevation.

Referring to Fig. 1 of the drawing, A

indicates a tank located at any convenient of the general arr-an ement' of my invention as applied to an evator serving to co-act with elevator.

through which extends t occasion requires, as will hereinafter appear,

connection is established between ports 4 and 5, and 5 and valve body 8, one side of said port being 6, through a port 7, in the wide enough to be in register at all times with portli. The part of the valve body at 9 serves to out off the inflow of air as will presently appear. Secured to one end of the valve body (see Fig. 4) is a two-arm lever, one arm 10, of which carries an antifriction rollerll, said roller being laced in the path of the door E forming a c osure to :the elevator shaft at either floor. Arm 10 also carries a stop pin 12 which engages :1. lug 13 cast on the valve casing, same pin 12 in stopping the orts .6 and 7 are in. regisy being acted upon rota- 14, one end of which is valve body when ter, said valve b fively by a spring fast to some convenient object, the other end connected to the other arm 15 of the lever hercinbefore referred to. v i

Referring to the drawing, F indicates the feed pressure pi used in operating the Locate at any convenient point on said'pipe line is an ordinary gate valve 16. Instead "of the ordinary cap used on gate valves, I provide a cap ofspecial construction, conslsfiing of a cap 17 provided with a packing box and gland 18. Rising i i-om cap 17 are a pair of legs or standards 19 carrying a cylinder 20, provided at its lower endwith a puckin box and gland 21 e valve stem 22 0% the gate valve. Fixed to the upper end of stem '22, is a piston 23, between said piston and head 24 of thecylinder is integlposed a compressionspring 25 tending to ose valve. The cylinder casing is provided with an opening 26 to permit easy movement of the piston. Threaded in the lower end of the cylinder casing is the terminus of the line of pipe 1.

y device is operated as follows: Assuming that the elevator door E is closed'and the elevator car ascending, the valves 2 will then be in position as shown in Fig. 3,

the

the air which is produced by the com ressor B being discharged into the tank A t rou h the line of pipe C; from the tanlr A, the compressed air is then discharged through the progressively connected line of pipe 1, through ports 4 and 5.01 the valves 2 which are in register, by way of the orts 7 therein respectively, where it is final y discharged througha sect on of the pipe line 1 leading into the lower end of the cylinder casin 20 and below the piston 23; the pressure 0 the compressed air being sutlicient to overcome the pressure of the spring 25 and cause the piston 23 to ascend, thereby opening the ate valve 16, and ermittin the pressure uid to flow throu ii the fee pipe F, necessary to cause the e evator car to ascend. When the elevator car is stop ed in its ascent at a particular landing, an the door E opened,

the tension sprin 14 attached to the arm 15, causes the va ve to open as shown in Fig. 2, with the ports 5 and 6 in register, at the same time port 4 is closed by the body part 9' as a consequence the air pressure is cut ofi and the air in the pipe 1, is ermitted to escape through the port 6 w ich is in register with port 5; as a result the pressure is released from under the piston 23 and by reason thereof, the spring25 forces the piston 23 downward, thereby closin the gate valve 16 in the pressure pipe 1 consequently the ower is cut off, thereby rendering the furt er ascent of the elevator car impossible. By reason of the connecting ell 27, the pipe 1 is extended at 1 and is connected with a similar valve (not shown) controlling a similar gate valve on a discharge pipe (not shown), the valves bein in all respects similar and operatin simu taneouslyand in unison with see other, consequently when the ate valve 16 on the discharge pipe F is c osed, simultaneously therewith will the discharge pipe be closed, by the similar or duplicate gate valve (not shown), as a consequence the elevator car can not be made to ascend or descend; it also follows when the gate valve 16 is opened in the manner alread described, simultaneously therewith will be opened the similar valve on the discharge ipe, thereby ermitting the elevator to e reely 0 erate as long as the door E remains c osed. Inasmuch as the descentof the elevator car is operated by the releasing of the ressure by which it was made to ascend, it will be readily seen'that the control of the car in descending is governed by a similar gate, valve operatin charge pipe as that of the va ve 16 which has ust been described in connection with the pressure ipe F, in the ascent of the elevator car, lioth these gate-valves bein in all respects similar in construction and operation, and are adapted to be 0 erated simultaneously by the single source 0 power and through one and the same devices.

What 1 claim as new and desire to secure by Letters Patent, is:

1. A device of the character described, comprisingla valve provided with a plurality of ports t erein, an arm for automatically opening and closin the said ports, means secured to the arm or eflectin the registration of certain pre-determine ports, a gate on the dis-' valve, 9 cylinder carried thereon, a iston reciprocably secured within the cylin er, a spring secured within the cylinder above the said piston, a valve stem connecting the said piston with the said gate valve, means connecting the first mentioned valve with the said cylinder, and means for en aging with the said arm thereby severing 51c registration of the said ports, and effecting the reg istration of certain other pro-determined ports, whereby the said iston is automatically made to ascend an thereb open the said gate valve, substantially as escribed.

2. A device of the character described, comprising a plurality of valves, each comprising a casing provided with a plurality of ports ppening thereinto, and a revoluble plug secured within said casing, arms connected with the said plugs, means secured on one end of the arms for securing the said rcvoluble plugs in register with certain of the ports provided in the said casings, antit'riction rollers provided on the free ends of the said arms, means for i'orcin the said free ends of the arms backwar thereby severing the register of the ports previously maintained and establishing a new registry between one of the said ports and an additional port provided in the said casing, and means for progressivl connecting the said valves one with the ot ier, substantially as described.

3. A device of the characterdescribed, comprising a lurality of valves'and a gate valve, :1 cylin .er provided on the said gate valve, a piston secured within the said c linder, a sprin secured within the cylin or above the said piston, a cylinder head secured on the upper end of the said cylinder, :1 piston rod' connecting the said piston with thesaid gate valve, a packing box and gland secured around the said iston rod between the said gate valve and c said piston, and means for operating the valves whereby the said piston 18 reciprocating within the said cylinder thereby opening and closing the said gate valve, substantially as described.

4. device of the character described, comprising an air compressor, a storage tank, means for connectin the compressor with the storage tank, a p uralityof valves, each comprising a casing provided with a plurality of ports opening thereinto, and a revo uble plug provided within each of the said casings, arms exteriorly provided on the said revoluble plu s, tension springs secured to one end of t e arms, anti-friction rollcrs secured on the opposite ends,-a gate valve, :1 cylinder provided on the said te valve, :1 piston secured within the cylin er, a spring secured above the said piston, a piston rod connecting the said piston with the said gate valve, means for progressivel connecting the first mentioned valves wit each other, means for connecting the said too valves with the said cylinder, and means I for operatin the said arms on the said valves, where the said gate valve is opened and closed, sngstantially as described.

A device of the character described, comprising an air compressor, a storage tank, means for connecting the compressor with the tank, a plurality of valves, each comprising a casing provided with a plurality of ,ports therein, and a revoluble plug secured within each of the said casings, arms exteriorly, provided on the plugs, tension springs secured to one end of the said arms, antifricti n rollers secured on the free ends thereof, means for progressively connecting the said valves 'with each other, a gate valve, a cylinder provided thereon, a piston secured within the said cylinder, a spring secured above the said piston, a cap provided on the said cylinder for securing the said spring therein, a iston' rod connecting the said'piston with t e said-gate valve, a packing box and gland separating the piston frqnnthe sai'd gate valve, means for connecting the first mentioned valves with the said cylinder, and means for o erating the said-arms on t-he said valves, t ereby cans in ,the said piston within the said cylinder to e reciprocated therein, whereby the said gate valve is opened and closed, substantially as described. f a

6. A device oT- t-l-ie' character described, comprising a valve provided with a plurality of ports therein, an arm for automatically opening and closing the said ports, means for acting u )on the arm for efiectin the registration 0 certain ire-determine ports, a gate valve, a cylinder carried thereon, a piston reciprocably secured Within the cylinder, a spring secured Within the cylinder above the said iston, a valve stem conmeeting the said piston with the said gate valve, means connecting the first mentioned valve with the said cylinder, and means connected with the said arm for severing the registration of the said ports already established and effecting the registratiomof certain other pie-determined ports, whereby the said piston is automatically made to descend and thereby close the said gate valve, substantially as described.

in testimony whereof I aflix my signature i in presence of two witnesses.

LOUIS J. MILKE.

Witnesses E. W ALTON Bnnwmo'roiv, MARY M. Macauv. 

